The AREF input does not exist on the board.

The Analog pins(A0,A1,A2,A3) can also be configured as digital pins(D18,D19,D20,D21).

The Tilt sign(~) represents the PWM pin.

How to program Pro Micro?

Hardware and Software Required

Arduino Pro Micro(5v model used here)

Arduino IDE 1.0.6V

Program for Arduino Pro Micro

Like other Arduino,the Pro micro has no on board led.So we need to connect a led externally to the Pro micro board.Before uploading code to the board,select the board under tools menu as Arduino Micro.

void setup()
{
pinMode(2, OUTPUT);// initialize digital pin 2 as an output.
}
void loop()// the loop function runs over and over again forever
{
digitalWrite(2, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(2, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}